remote fiber testing

7/24/2019 Remote Fiber Testing

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A NEW APPROACH TOA NEW APPROACH TOREMOTEREMOTEFIBER TESTINGFIBER TESTINGIN OPTICALIN OPTICAL

NETWORKSNETWORKSKreKreoomakmak

University of Zagreb, Faculty of Electrical Engineering and CompUniversity of Zagreb, Faculty of Electrical Engineering and Computinguting


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IntroductionIntroduction NewNew approachapproachto RFTSto RFTS

SystemSystemarchitecturearchitecture

ErrorErrorcorrectioncorrectionmethodmethod MeasurementMeasurementresultsresults

SummarySummary

OutlineOutline


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IntroductionIntroduction

OpticalOpticalcommunicationcommunicationsystemssystems(OCS)(OCS) formformthethebasisbasisofofallalltelecommunicationtelecommunicationnetworksnetworks

TheThedevelopmentdevelopmentofofOCSOCS waswasfollowedfollowedbybythethedevelopmentdevelopmentofofRemoteRemoteFiberFiberTestingTestingSystemsSystems(RFTS)(RFTS)

TheThepricepriceofofthethecurrentcurrentRFTSRFTS exceedsexceedsthethepricepriceofoflocallocalandandaccessaccessnetworksnetworks

ErrorError--detectiondetectionandanderrorerror--correctioncorrectionraiseraisetoto fewfew

daysdays,, evenevenweeksweeks New RFTSNew RFTS aa lowlow--costcostandandreliablereliabletooltoolforforerrorerror

detectiondetectionininlocallocalandandaccessaccessnetworksnetworks


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MeasurementMeasurementsystemsystem

TheThenewnewsystemsystemrepresentsrepresentsthethefundamentalfundamental((simplestsimplest)) formformofofthethefuture testfuture test systemsystem

MainMainpurposepurpose

ErrorErrordetectiondetectionininOCS (OCS (mechanicalmechanicalfaultsfaultsororqualityqualitylosseslossesininopticalopticalfibersfibersororconnectorsconnectors))

MainMainideaidea

ModificationModificationofofthethecurrentcurrentRFTSRFTS ininorderordertoto lowerlowerititss priceprice

New RFTSNew RFTS

OTDROTDR asasmainmain

measurementmeasurementunitunitOpticalOpticalpowerpowersplittersplitter

SoftwareSoftwarecontrolcontrol

CurrentCurrentRFTSRFTS

OTDROTDR asasmainmain

measurementmeasurementunitunitOpticalOpticalSwitchSwitch

SoftwareSoftwarecontrolcontrol


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MeasurementMeasurementunitunit

OTDROTDR

OpticalOpticalpowerpowersplittersplitter ControlControlunitunit

PCPC

SoftwareSoftware PrePre--measurementmeasurement

managementmanagement

PostPost--measurementmeasurementmanagementmanagement

SerialSerialinterfaceinterfaceconnectionconnection(RS232)(RS232)

MeasurementMeasurementsystemsystemarchitecturearchitecture


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MeasurementMeasurementprocessprocess

1.1. MeasurementMeasurementsetupsetup

2.2. OTDROTDR launcheslaunchesthethepulsepulse

3.3. InputInputpowerpowerisisdivideddivided

4.4. OutputOutputpulsespulsestraveltravelthroughthroughthethefiberfiber

5.5. AllAllscatteredscatteredandandreflectedreflectedsignalssignalsformformaa complexcomplexmeasurementmeasurementtracetrace

6.6. OTDROTDR tracetracesavedsavedininthethecomputercomputermemorymemory

7.7. MeasurementMeasurementanalysisanalysis


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ErrorErrordetectiondetectionreferencereference measurementmeasurement

BasedBasedonon comparisoncomparisonofofreferencereference andandtesttest measurementsmeasurements

ReferenceReference measurementsmeasurementsperformedperformedafterafterthetheinstallationinstallationofof

thetheOCSOCS MeasurementMeasurementpointspointsdefineddefinedatat characteristiccharacteristiceventseventsonon thethe

OTDROTDR tracetrace((splicessplices,, fiberfiberendend,, connectorconnectorreflectionsreflections))


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ErrorErrordetectiondetectionmeasurementmeasurementcomparisoncomparison

ErrorError::

TheThedifferencedifferenceofofthethepowerpowerlevellevelbetweenbetweenthethetesttest andandreferencereference measurementsmeasurements, at, at thethemeasurementmeasurementpointspoints,,exceedsexceedsaa predefinedpredefinedtresholdtresholdlevellevel

TestTest measurementsmeasurementsautomaticalyautomaticalyperformedperformedinintimetimeintervalsintervalswhichwhichvaryvaryfromfrom11 minminto 1to 1 hourhour


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RFTSRFTS managementmanagementsoftwaresoftware

SpeciallySpeciallydevelopeddevelopedforforthethenewnewsystemsystem

The program was developed using theThe program was developed using theMicrosoftMicrosoftTMTM Visual BasicVisual BasicTMTM software packagesoftware package

ThreeThreemodulesmodules

MainMainmodulemodule

ComparisonComparisonmodulemodule

AutomaticAutomatictest moduletest module TheTheprogramprogram partitionpartitionenablesenablesaa simplesimpleandandfastfast

softwaresoftwaremanagementmanagement


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MainMainmodulemodule

FunctionsFunctions::MeasurementMeasurementsetupsetup(OTDR(OTDR setupsetup))

ReferenceReference measurementmeasurementcontrolcontrol

MeasurementMeasurementpointspointsdefinitiondefinition

UserUser--friendlyfriendlyinterfaceinterfaceeasyeasyandandefficientefficientmeasurementmeasurementpointspointsdefinitiondefinition

5000,500005000,500001 to 99991 to 999910,20,50,10010,20,50,1001310,15501310,1550

SpatialSpatialresolutionresolution((numbernumberofofsamplessamples))

AveragingAveragingtime (s)time (s)

OutputOutputpulsepulse widthwidth((nsns))

WavelenghtWavelenght(nm)(nm)


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MainMainmodulemodule useruserinterfaceinterface


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ComparisonComparisonmodulemodule useruserinterfaceinterface


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AutomaticAutomatictest moduletest module

ModifiedModifiedversionversionofofthethecomparisoncomparisonmodulemodule FullyFullyautomatizedautomatizedtesttest measurementsmeasurementsandanderrorerror

detectiondetection

ModuleModule parametersparameters:: MeasurementMeasurementrepetitionrepetitiontime intervaltime interval

ErrorErrortresholdtresholdlevellevel


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MeasurementMeasurementresultsresults

PowerPowersplittersplitter90/1090/10 simulatessimulatesthethecasecasewherewherethethepowerpowerisisequallyequallydivideddividedto 10to 10 fibersfibers

AsAserrorerrorcasecasewewedisconnecteddisconnectedoneone fiberfiber

1000/30001000/3000

3000/30003000/3000

(5m(5m differencedifference))

1310131015501550

1010100100

50/5050/50

75/2575/25

90/1090/10

TestTest fibersfibers(m)(m)WavelengthWavelength(nm)(nm)PulsePulse widthwidth

((nsns))PowerPowersplittersplitter

WavelenghtWavelenght, pulse, pulse widthwidthandandpowerpowerratioratiodominantlydominantlyinfluenceinfluence thethemeasurementmeasurementresultsresults

MeasurementMeasurementparametersparametersvaluesvalues::


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NoNoYesYesNoNoYesYesNoNoYesYesNoNoYesYesNoNoYesYesNoNoYesYesErrorError

detectiondetection

100100 100100 100100 100100 100100 100100101010101010101010101010PulsePulse widthwidth((nsns))

1550155015501550

3000/30003000/3000TestTest fiberfiber(m)(m)

15501550131013101310131013101310WavelengthWavelength

(nm)(nm)

90/1090/1072/2572/2550/5050/50PowerPowersplittersplitter

ErrorErrordetectiondetectionforforfibersfiberswithwithsimilarsimilarlenghtlenght


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YesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYes

ErrorError

detectiondetection

100100 100100 100100 100100 100100 100100101010101010101010101010PulsePulse widthwidth((nsns))

1550155015501550

1000/30001000/3000TestTest fiberfiber(m)(m)

15501550131013101310131013101310WavelengthWavelength(nm)(nm)

90/1090/1072/2572/2550/5050/50PowerPowersplittersplitter

ErrorErrordetectiondetectionforforfibersfiberswithwithdifferentdifferentlenghtlenght


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TheThenewnewRFTSRFTS aa modificationmodificationofofthethecurrentcurrentRFTSRFTS

ParralelParralelfiberfibertestingtestingusingusingthethepowerpowersplittersplitter TestsTestsconfirmedconfirmedthethesystemsystemefficiencyefficiency

Future :Future :

ActiveActiveopticalopticalnetworknetwork

ErrorErrorlocationlocationmethodmethod

SummarySummary

remote fiber testing

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